I bought one of these last time around. The only downside is that this is NOT and authorized mac seller. The seller lists that these have a full warranty but the last time they had this deal they shipped them so that they arrived the day after their 3 month of phone support ended. I'm guessing these will show in Apple's system as being purchased months ago as well. Still no tax and good price.
However, if you want full warranty, support, or options for apple care you can get this from Macmall by using Appleinsider's coupon. Linky [appleinsider.com]
for $1,066. If you want the warranty it's $66 well spent.
Just contact Apple and show proof of purchase. Apple will start your warranty from purchase date.